Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f40750c3eb1c78b9166c72c1fc521bf94ac8642dd6d43b3fdecd22aef9d97b12' 
  AND token = 'XIuJSVD7kBjHzU05LXL4OBjN7Wfa/2o8fyBwT7w+d+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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