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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '07e064dd76257600299dbb6796f0b596dda56a50e657f8f5df23d54c27b8f8f5' 
  AND token = '3cCcSVclytDfwqvFNFDIn6Olfn+BAIU8asIc6IYWpVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00785

JSON explain

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