SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04fb651d863587384e82e3b370379b909298c8b1cbaa79f3f0ddc88a3c7d6c42' 
  AND token = 'WD8tVcIqhYHRiJZsntjFCoKMGBRnbD88u1HqU/dLjI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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