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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c39f3e0f78d287df77ff0b1148c581634ca14b0ffe29b83dd181207aa6d451f1' 
  AND token = 'ILVBDNDtDjTMt3NHeRzFu3zoV1gsVJB36VJMTATF9W4=' 
  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"
    }
  }
}