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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb14ef596b213aa081012bfd30a7c6d6fe76f30e4e1d8415f671f817c99195a0' 
  AND token = '5SiSfuSeaQ01gyH5zAWkOOluvTazx9b3vod4whT5I40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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