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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '12053d4ac7a5e0c059e6852e78710e0810ecfcf04137869924408b8dd57e5a76' 
  AND token = '0OUF6NPJDc35ts2CyEUw4b9LAhF3K2ZDFCt3p3Y+1xk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00803

JSON explain

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