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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'c723aa6559fd836052a8078c3bc2fcd6d57fa9302b318cbd2522118d3314eb16' 
  AND token = 'RlU4yA/9nOD9Cn+EY1m2AsV6Pv2rtFrIuHvK49p7hPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00917

JSON explain

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