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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '1d1b468e0040c0884d32f68cca78a778ccf70e08ca5dd58f24a7f259cd20a803' 
  AND token = 'zBnMRDYPOfnucA+R5VVM9A0cfyJcAE3nVaw+AcXCAD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00775

JSON explain

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