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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '648b8c4fdaac79e5e4c478d025d6ea75fdc8779e1b04c6f120abf64f53f0fc62' 
  AND token = '9XtcI8+plpmvYoHQCoOf/veq5hdadJnMp+sa/uwwXzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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