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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cd493c587a3207a9e8ed9afc48f43c7b5ae4298b879bc5858798d8d218bb77e' 
  AND token = 'ymcqxuwgthZSk0sI+vHI31XNQs1ykTFn+8NRPKkd3II=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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