Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e92477fd6a250aa52839439530b1c7cb8c8e3b7f93103fd216bfb11b3f4cd3d' 
  AND token = 'dTWyQc1CRxEvexLSR8DBAa7Chm7pGEXhTLmiHlcSY+E=' 
  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"
    }
  }
}