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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8fc7024e8edfe4291b0f829941b2ccc4caed5912317f0af9258935452a9cf62' 
  AND token = 'pLBJfep9ik/xGmsHuApqef8S99UkPVFd3PvQGr6ylLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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