SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66c3a1d385ee397f506c56279ded785042a77f247ad9685495fe0d309b0ca79d' 
  AND token = 'tFEm3AQ+FNnJNCYDwVKeMCnZPRAzL6HUUgChG47J+XM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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