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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'aa019ba43a0be5db488e59c3e12aee9f920af2b07514af56e5cf4e4bdd696f3e' 
  AND token = 'Q3gcDKYITok6PWCwgQlsnbQVatZ7qYRxDvmXkcFQgx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00760

JSON explain

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