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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbd62c8ec6b79f1498db2bc5b3cfc3fbf4a341343c0d476c233d2c630a98895b' 
  AND token = 'RL7mD6eijTng7Qq2cPYKKlwUt9Pgyucsge+jWOnvr6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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