Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c48117c0afbc99111a48e78211104b066916eb2c3766d715ed14aac03ff4e754' 
  AND token = 'wRdZxTgwD0ZFojhN6Vu5Qh4mlUtZXmqz7Y74mIvCpk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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