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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'fb8c4f03821f244659d9c499d49c467a01e593a5d1c290201cbe96bcaa778f1a' 
  AND token = 'Q0GKshindpYPCJaVCNdCOVYRunsvSPoB3CflfCEB1bM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00944

JSON explain

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