SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e22b4360d870b288acc6970bae21eb9070fd6540a3e547258dfb6c19f652c75e' 
  AND token = 'rfvyU6S/fcPkaZCXbEZg9hVHB1QAmJkJsKZvvKzeY7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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