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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '596862cfe119e2d15a8cf6c5faf568900f61c6c1dfc0c11247857972809eb5e9' 
  AND token = '038pZCU3E9kqTqLI9HwgJgVXfkf4d+hXRKN+EJlKWnA=' 
  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"
    }
  }
}