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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'afad84e2929e789083e5b18f4c8170f15c0df57976e74bce9f59c47f071b470c' 
  AND token = 'nL/t4q2fzld2MrY5VhlhynnbXhT9qIkLLt1DcqV3CZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00008

JSON explain

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