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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '7be773aeadeefe6a0601059e26ab68fe5b2169c502eab5f496afdbc986576fd1' 
  AND token = 'oVrFa13j+LgZRP863SCqpBh4WbjPkQsdHm/HowHNBEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00767

JSON explain

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