SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e310c122eca7de28ac236f5da9479fb5d127f5f4e53a7ac46ccd19b06ffd2fd' 
  AND token = 'pBKYIDUput0TpUpNggzZVO+6gZkX4Dhy2o9Z1x/hkms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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