Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85ae93613e5099ed2bafa99c3f5d16b8a1ea8e622629bdb63780ef6e40541c86' 
  AND token = '6RBiuGAfodKIDELOUKDpyEXtrQVbL2C/XfZHLnYficU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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