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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '124b3e318dbed797d30961080ff881be72e030e4baa540bdb15739d12329680b' 
  AND token = 'Mo0D6sYO3D1E3fVUkxHeSBOVHSqex3lbzQziRUa2Ivs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00768

JSON explain

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