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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '73155d59940168d46a4ec9eef8753a29c8a1e6903cce15e50d124a3a05a23d90' 
  AND token = 'Ve+Z+Da0LADsC2m2Ig7VLtrR1L1fDRb36avdKE52k6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00758

JSON explain

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