SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2f419ac0fe6d75b43aa169db9f006387fa7ac08336dcf4fb068327069f411bb' 
  AND token = 'W28fRQj/hl+LU0jAPGeMKXmXh3ggRVMQMY6IrttOnV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00163

JSON explain

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