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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53db1e17ef2734493ccfe3511af1fe88d64c3b9ed3fda9e84843f27fe53ccc25' 
  AND token = 'fYPiYfkgUWAJav7v5cqXB+7iHF83q0Vk1aqiX+onv4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}