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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '46ad6a762be85a1e6e85bb65e8229b7671cc3806ad92b3466187f3bfa41745aa' 
  AND token = 'u3PCJfW5Mvej27Fzw5FfF6miDBiisc3G97h5gzaPyWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00922

JSON explain

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