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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '423a4ff6e1c9cd9e51247d7fe6fcd6fc67636be9a6cca97ab858dd0c33eb3839' 
  AND token = 'ally4SB4sju7sY08OalMpLGbKIkaj6dxc8lcz/pPUns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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