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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82fbb3e341db330d26ff5c6d5dbcca9e77212b5a15c0e93cc9f7f8e1534af21a' 
  AND token = '6C8zcLPC5QlTVYQruBkTObus2KhzGVAR2nEdrhn06/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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