SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ac56576030971abbf8876a54a1badadff196c34ad8994020f266e2c0d34ab7c' 
  AND token = '17O5lgVBAgUHjZYeRqGb68dKniJk02YGWkLPmq4bz28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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