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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '3696e191224e38b80c5efe254c6748134a0fd5348f32ebc3223236341b30c86e' 
  AND token = 'd8URZCvRy6lm+vNZfljWAvaNm1pq5ivKj273IZtGY44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00800

JSON explain

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