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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '203c6fee86130304d9eb67b6ed6613bb9a69c741bea44a4d3380a33622058fb6' 
  AND token = 'KbdpyhOT4ncBSQ6aguaBP6KIwDwTYQvYqxBzNSHCH3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00755

JSON explain

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