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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cb3d9de0c0ce159de9fc4c595a415c134acb1764588ea60979b58c8e5bc991a' 
  AND token = 'SdWzahk+sQbL01hLgoQF1nUOsR1QaLOOCENNtls/iL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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