Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d770be9ad9a26e77108441f7851859e0d9a919d3d6c8691547bc8224e6a2d47' 
  AND token = 'TRQwCYbvFTarfUAZGhZy8+HpRelh0Ou372MW3YYlmqI=' 
  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"
    }
  }
}