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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '652dba86a62761e89ca47113874d769f09f15bfb03888667fc54d403f9821f94' 
  AND token = 'Ld0a5dJzyxrLvNQytQ1FK53u7AP4RmiBmy8qlyB9J7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00756

JSON explain

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