Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fa367b4adc64814135eebd5cc09b33895c3258564c35a036fd0695714855da9' 
  AND token = '6ifDbjS7vW6ozeEPePpwyTNXy5KsYS/5fKCVMN3Jifg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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