Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57eb64ab52a121075117f87d14ffc5e2ebda7ab5ba04cb47463e7dc7570fd609' 
  AND token = 'EFjmtmDsH4yaxEfxurOf7tlwUzVW6NIY2/kI3FdaC74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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