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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19bb2a16b0041ab6902ddf924bba6ced78b903c82a3a158becd7845addfbda54' 
  AND token = 'pyQc9zG6kZtL8baTp676Ifo6uuPqSqNeUxemArtOvW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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