SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '438ee3d9fd26237b3f418447fcb5bf549dfcdfbf781fc7bda5ed9be92ef4cfe5' 
  AND token = '9qLecGTfmZXZX5F3VRoNuJ1Cme91o43e9VP7644c1+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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