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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '7b2860fd6ee6626707cfb18c6c867d11b07648b388c3a9ecf3fd9c527fae0ff2' 
  AND token = 'W1sRv1qhEykuLoFBEEdkDqgSKV3M/s+a8/APgSVDLQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00774

JSON explain

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