SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faecab976d3111bf52f60b27c0a58eed3baf6969f0d9493d4d0448bb7d6e1acb' 
  AND token = 'bSsCJqTjJ8m0fp5yJKX7UHVz4SqlDgZrJWYfmJ/EptU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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