Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f99b95b7dd8895bc50e43c1a6dbde1651848df2102e41838fce84fdb39ae5870' 
  AND token = 'YWcl/mYhd1/jte+eo0AjPHX5a8wK9jOseGrh0TVBRak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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