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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '20583d5ea3800b93b25750c620c8206e12a61567bffd16340ea714a1671ff148' 
  AND token = 'OV2v4x72RFrnHhi63HWL/g9Z3nAkHYvjT3pOu5LYUxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00751

JSON explain

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