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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '023b6f6f9d1f50a77527a8f61738ff762bcbc96864d5983d02df62a375adcf8f' 
  AND token = 'c9m9k1cRPxqSonkGdIPH7pgNzH0XtJ9b+fEmwBOndy0=' 
  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"
    }
  }
}