Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3bdd8f387152ebf33596cf83b8d442f0d4172048ef0e290263ab694b25df1be' 
  AND token = 'L0LjU3mBFj1sl6ki1ynHvNFcf4Mo8JRaOHjrTyidhWM=' 
  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"
    }
  }
}