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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfef370220145b4190ecdd78efd188356ecfd18b41189c611737f9780290b59e' 
  AND token = 'OAqmCYYY0V9LHMHIl3/b9R1QHdMrOSqqL+L7m8u7Yfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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