SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32ac7e2218ee494a7564d238d0087875fff57fee615ace8f2b8d01f29b4655a9' 
  AND token = 'F7tJsvmCPugWwI/DDRrBJ4chm4MV/BVPiMA/mhtDHOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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