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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'f1f99ea280eee8d1db0390d942c1fa64c8ec22a9193d04d8a22f5f3e56817386' 
  AND token = 'KkLKnVGQ06NAy015yPM430+hZqP5uImLd54Rf55npOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.01075

JSON explain

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