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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'aa3542c7f91c2bebf4b2368166dd6abba9c0ea0110669eb3f5fce5a861560611' 
  AND token = '29Diau9r4Ye9heOhyDZcXKZWWDLTMcmLlutkChWqxRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00995

JSON explain

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