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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c58d0f557b217bddebdd560efa7ef110440eb7a0ebbc07379ead29e7980f442' 
  AND token = 'ShUWhAhNR/5kqM39Q6yAe5ti2VHxE6hGaNrvN9L1H6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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