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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'edfa55a6184b041c47c8c242a97a6b1ba6463dc682d4e640ada38dc418421e26' 
  AND token = '+Yb/Ixz2OjHdLbWX60biARRjgVRnSGgOdcE1MhmUhcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00781

JSON explain

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