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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8791cdc49cfcd2d9905603d8f87da6f7be905d4a15a0f9c283985fe3e278a71d' 
  AND token = 'mY5k9R6Cnc+N3/YNr+22u6cxEMjUj/fQVaH4Vv7/FXM=' 
  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"
    }
  }
}