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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '6a4a33ca7763f180a5cb9c776fb4b9bc8e8da83c102b0716ba347244c25e4c42' 
  AND token = '5XCL3FEBpYWPkO8r/7UsXdMcrGjf+X6PW9x5T9qR3eo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00825

JSON explain

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