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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'b3c7af6926e25127a2217bcf37e8ac61a565f981e6149cd85bf047f78abc51bc' 
  AND token = 'UoHu+tfoHq6eRv5cPzeww9/mXyo3nPWl60VP5QJLIIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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