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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4070dba76e950fe0538ef2da4814a9e444de35e4cd86238086b8d3ac130b2099' 
  AND token = '0cm9uBtNbI175gVjHlAA9GeGi8rn0+bLCemcaDTMkS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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