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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '00b5c128bb2bd715db9ccde6548b513c0fd0dee44614bb6b9ea9d48e32aff2d7' 
  AND token = '1OYL/zWBnC8wQlYVMvSMFdAtDsV7p60YIIFDJSMnLg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00779

JSON explain

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