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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '0e1e3bc29b20bd9ded65cbb8fb674f323244e77ddd8e729350beb29514ac9897' 
  AND token = 'Bj3NJVLClC1Ml7KQ7c+Q3awiWcd3nw0vehmRwx0KopI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00820

JSON explain

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