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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '6a325c5e74d4a3ad6ec6598dc458a4364041c1cf1ca6775b77744fe5983a7808' 
  AND token = 'AO5ottkkxxMtg9+giwFzkaAcW7a/OabySEziz5yAyOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00761

JSON explain

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