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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '59a64e3c7a263acdafbe88049bcd73e67790014b9fa33f5bdff0dc100a2d5a4c' 
  AND token = 'RvuYrLPhEbScCObdLj7h5mjCq8zCyxkvY2cT8xITm7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00855

JSON explain

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