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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba3e001e519fca6429704dff74f12f6fc37fbda2dccc32a08fa08594f421f23c' 
  AND token = 'kK0XbI0Z8yc3EeDLyG0ZEd3cIHQ5co1JErCFL1BmCng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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