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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'f5d1fd38a027f705410831099a5292a932ae5fe5c63af401f8538732bcd44777' 
  AND token = '5vy2umTMt4BnAAxbRTYZu2WVXmri+Wci0YdxFEhDcFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.01007

JSON explain

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