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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '5bd322ebce7b37f741e5cc545bab2a9639399d6a35cbe88ca0de8de97926d67b' 
  AND token = 's8PH+W8f+S6/LGOnArkL4iHWnzjxnCPucZ+ab3Dnm2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00817

JSON explain

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