Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6b93dcf1f56ef45eaac1e95f4803d76b6efafd383810592f37601bc75bf9138' 
  AND token = 'gF/j0mucbiM8T0pJfiqAPCQahVGM1oYkJbPCJ1FcTkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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