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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '55403c777bac1bb4697e3e7b07b0e03003731772b17c235c288a52ce8d7674d4' 
  AND token = 'rHIozskMG45PWZT8zKeyi3Y5wEl9+DmOinzAeLUkBjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00757

JSON explain

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