SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '262205024d90a27381ccae79591424605b68b2989bc2fd3aa5db538de7f84da5' 
  AND token = 'eOZ+T3+r0LC87TJqVfqwPwhXKN1Bg+fgLlGMwvH0Mp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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