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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '2c45970f3c802968232d83f11e1bef7cae5df127b181bc2c848f82aaba946da2' 
  AND token = 'TJ4pv0tdiW+8Av1FKfsZXsIILupcAU7r8PlbKaMdhHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00780

JSON explain

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