Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7596dd0295695b4e2db5d8a39269af161db22538b48728a7c8f46f2b51f16b33' 
  AND token = 'zVap9VJMx7dxcf4fnteYKf660sBdDVgA6hQ/9HVelMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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