Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3d1f3a77945da2a338f49dfd3bff50ee7d82c9ea34c2745b3470d247dce96f2' 
  AND token = 'Rr7TvXeXUntA4RCEuNSlPne3auWgU1Yjcl434tQJT+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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