Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1b198ec1d9222c1346a871c3567dac2a3d45f1ea46045495d7da1b345388452' 
  AND token = '2HmTgN7UFwsq3QXBjMCt+udNS2CbXf/4ouaKo6IbQSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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