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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '3e58b6442eef7ec7dd7a8a9719d4039288741e989e0bb44501e3475177e5ec0c' 
  AND token = 'G3fNH4bZQ8gwmDIFEtTsmrbeGDQ0Tmlmvz70x+wXJhs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00794

JSON explain

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