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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '4f5bd5487582907617fbed7d5911a207b87cebf9922880589023e5e1107ca828' 
  AND token = 'QfPTQACGU2BJAXitgXIgtuYl3DV1yHLaz4Pfb/+E/24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00821

JSON explain

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