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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'fc86a94e513a7072e78c7f265c6b1256362547a53967819e9cfef6520235d140' 
  AND token = '2LqI7/izQBaDBkmiU2PL81UOMumqgmAUmI2BK6by38U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00844

JSON explain

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