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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '8d08772857914bfe0e4cd9b87cc9c1219d90c005f7d672af0ec374c92e3adb06' 
  AND token = 'Eu/ohcMuOSCRvxSgXZ7Y/dv/DhO2W2qcntLRMAfMJFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00811

JSON explain

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