Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74737096d071d035ddb3dcf6b109493c40869e09ee27d5afe001c9289452bc29' 
  AND token = 'YwrHTEa4xQDrRFmu+gcAAiqc1dJ/17BjzUg8zFOiqxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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