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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '4c604b52fd31dadb0ea1251cfa4ff4c2136b0d889a040a7d2137f4d985848010' 
  AND token = 'M7bILPotsk2sfZLPLsuIVDzbQ+5ASI7mVrCsq2M0o8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00749

JSON explain

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