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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cad8070cc18399a3313ad23eddd190c4a4ae1e7f48d0b3f87ad8807e190e1de' 
  AND token = '0ZY7Y1y7c7YBQv8iB9tJh3T4WKJVtpya+YOKw0ozhLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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