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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'dbc6689cbf44a2682618c408afcd8106619e346169d0051ddcc8da5693de4bf1' 
  AND token = '0+wV9nHqf9N8DPLCcUO5vChodsliniDD/rpSanxJiUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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