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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'ebb04e075544a7ad554b4666fceba0db8ee06bed2982dc3ca8960faec9771859' 
  AND token = 'CHJtG0G98OBgwYKmGw4DWQmhlDLs/5z4/a6fyV8h5Kw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00766

JSON explain

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