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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a81da32748f0eb298b198158c86bbc7d58ffd3b4c7ecd48820002877519addb4' 
  AND token = 'hxAqqpt8MBNxMH9Gg+ZXqBxSnlaIWEHQL33Dp9HBqm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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