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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc5d6fba1bf6b7198bf90b62f550dc3e5e9eab5703e8a2998da9ef99017f97c7' 
  AND token = 'wUJKqD9RDJt8wrn/l3O14dlrZgFGtig4l/Do6Xh/I6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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