Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9709e1493e911965990d2a9586c0c36fee189a0b1aa262f37c7ac8ae53257c5d' 
  AND token = 'JFFWmh0gGZjIPgxgo2i14f6Smpc25+8/Anlc/Bblja8=' 
  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"
    }
  }
}