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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '9fdfd7bf04bb51f89711e0a38c78d3d02ea5a063c335644b4b357db412d6c291' 
  AND token = 'i+5q05uHbdsuyHVYPsls9JmRsDCRMyOf+l6/QxzbrHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00750

JSON explain

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