Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3ce931eda5baff54c253510a9d3b9d63e597695e565d01d7c312d2ce955dcfc' 
  AND token = 'JYIy56AJFOWPjuRd6lFXN1GE1ezsHB1rdmQ7wCz27vY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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