SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72bff3862775a092f9d59db3b1de51775674523a09c75cd8525f9b4ae1fba06e' 
  AND token = '0PNDBdI8FUDXCrV94jJw5eo2sGwtFhBJNvtZFECbgmA=' 
  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"
    }
  }
}