Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57e584531e66287fa5bff632165fdd3f9a9b78ad89d528e964ba0f36cf84c313' 
  AND token = 'F56LiPq9504NAQ5vGoYLs+MMXCW+Tax0GpFWM936qzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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