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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '9289857dcfd9ac41f40463c5f272809a48e75ab25bc810d95f8f6ad8dc7c7ac8' 
  AND token = 'j+XzyPxLCZp9BIbHgZ0hM9b7IK4LxtVm2cOa2bm4WqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00823

JSON explain

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