Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5d20a02c6a7487a3c1e05a96b21fe837323709862d867991e137947a192f367' 
  AND token = 'zSnuUAY59fQYfoqj42/s1xtA6+W6Rk4BZHSP6txQvQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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