Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6f31cc02eda8cb49fa90c4a6265ed0875c4ba03ba41bd6673ad18785f18d3b0' 
  AND token = 'yNVZ0+50au8c590fh+ya7mC7XM9zrjCHqXtLR/CWU68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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