Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f076ee5e1145e4fd4ce5c156b457912686bc192a3bad28c4e6d9ee193227b31a' 
  AND token = 'we2sJzss70mtVHmpUDRdBTLuiqFT046sY+4A8rUFDE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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