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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c397e8f0b485ce27aed2cd52a184f28782bb24b95b254c5c15beb6ccc4ad350' 
  AND token = 'nvSyIvy4m/lZLLzp/RbbmD7W72e9+gP92kYgB50XW6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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