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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'fd1e43c34d724cfc9a863bbba356559778d6a80ab368c00a4269baf265bfcaf1' 
  AND token = 'b+pnQpzmW2HlN2fpFl19o2vlFmdBowkEFpRhHxifkHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00881

JSON explain

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