Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55d6c5fe34bcf750863a325e093a3fdfc60b086514612ea477819d09eae426fb' 
  AND token = '1577wVY1aBhbuX7R2c1SPTHsRHfbKL3VwRoDv1+HNBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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