Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf5e4c0ccb9d8c80fcdcc0540ccb9daee62d1bc1e02a7e4b7c25cd0ef74675d3' 
  AND token = 'Foj3GccREiUi6+72AodlFbNSTF8rKzKA28Tt95xYatY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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