Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8253f4ca61bbd087d3fdf25a89152874a02a8cdf4c8cdca621d41a62b732e7be' 
  AND token = 'th9tTWiMTO5WYLxSX2AXnjWizta4i/tbGk76F+shIYU=' 
  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"
    }
  }
}