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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '1a4bcc63600c265b6c41908d99bcb34766d1816bfb75ed226e685be03ef05b84' 
  AND token = '9Pq1i4zN9baZFe678aG8PPvoEFhKn49FvJ/slkQzMeo=' 
  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"
    }
  }
}