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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '536c07639c954520e4dcb172099abbea001268b8e33227adc868de05e2a9b3b8' 
  AND token = 'OUvIWmF/vW7/mMVlnjLkQszQf1ra9rEGVpH2/sRH1pQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00771

JSON explain

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