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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'dbe18ce9b9a0c84e0c34c5cb5f15cd92afc1473fefa31e6fc51964d8e0521bfb' 
  AND token = '6P5412DsD4yobT4YLAtNKGrJqLaS2R83WGVP1+jW6RM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00776

JSON explain

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