SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53f367c6294fb19f7194944caf499b64495e01f05a9cb96bf2589d2a8840287d' 
  AND token = 'asfWJCpGkGHekH/wnCRL+TN+xhXUQILkuV2h2gt1Gjg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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