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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '938301554ba8aaa8485d4f4baebac8d28f1fcc4f9396b5a4fc14ea5d54eac6ca' 
  AND token = '6EhfbJuPknvh+WZpWgrxR0oSeGIjLacjFqz63pg+c4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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