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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'f0168345fdbad5f7df85dfee8b0500620f0b26478355cab8d8332fb06b2ac1b4' 
  AND token = 'IlylltCptJU+DH6yfFcwb+wBxXKcT0s0cLo2eYi0UDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00859

JSON explain

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